Work out how many rolls of wallpaper you need for a room — enter wall dimensions and roll size, with an allowance for pattern repeat and wastage.
| Item | Value |
|---|
Wallpaper is sold in rolls, and the number you need depends on your wall area, the roll size, and the pattern repeat. A standard roll is about 10 m long and 53 cm wide. The calculator works out how many full-height strips you can cut from each roll, then how many strips your walls need.
| Roll type | Length | Width |
|---|---|---|
| Standard (Euro) | 10 m | 53 cm |
| American | 8.2 m | 68.6 cm |
| Feature / mural | Varies | Varies |
For a room with 12 metres of wall to cover and a 2.4 m ceiling height, using standard 10 m × 53 cm rolls with no pattern repeat: each strip needs 2.4 m, so one 10 m roll yields 4 full strips (10 ÷ 2.4 = 4.16, rounded down). The walls need 12 ÷ 0.53 = 23 strips. Dividing 23 strips by 4 per roll gives 5.75, rounded up to 6 rolls.
The single biggest factor people overlook when buying wallpaper is the pattern repeat — the vertical distance before the design starts again. With a plain or random-match paper, you can cut strips one after another with almost no waste. But with a large patterned repeat, every strip has to be cut so the pattern lines up with its neighbour, which means trimming off and discarding part of each drop. A paper with a 64 cm repeat can waste up to that much on every strip, dramatically increasing the number of rolls you need. That’s why this calculator asks for the repeat and adds it to the drop height. As a rule, the bigger the repeat, the more rolls you’ll need and the more important it is to buy all your rolls in one batch so the colour and pattern match perfectly.
Accurate measurements make the difference between one trip to the shop and two. Measure the width of every wall you plan to paper and add them together for the total width — you generally don’t subtract standard doors and windows for wallpaper, because the offcuts around them rarely produce usable full-height strips, and that margin becomes your safety buffer. Measure the height from skirting to ceiling at a couple of points, since older homes are rarely perfectly square, and use the tallest measurement. If you’re papering a feature wall only, measure just that wall. Once you have your figures, enter them along with your roll size, and remember the golden rule of wallpapering: buy all your rolls at once from the same batch, and order one spare.
How many rolls of wallpaper do I need?
Divide your total wall width by the roll width to get the number of strips needed, then divide that by how many full-height strips fit in one roll. This wallpaper calculator does both steps and rounds up, allowing for pattern repeat. Enter your wall size and roll dimensions above.
How do I allow for a pattern repeat?
A pattern repeat means each strip needs extra length so the design lines up, which reduces how many strips you get per roll. Enter the repeat in centimetres and the calculator adds it to the drop height automatically, increasing the rolls needed.
How much wallpaper is in a standard roll?
A standard European roll is about 10 metres long and 53 cm wide, covering roughly 5 square metres before wastage. American rolls are wider and shorter. Select or enter your roll size for an accurate count.
Should I buy extra wallpaper?
Yes — always order at least one extra roll. It covers cutting mistakes and gives you matching stock for future repairs, since colours can vary between production batches. The calculator gives the minimum; add one for safety.
How many rolls of wallpaper do I need?
Divide your total wall width by the roll width for the number of strips, then divide by how many strips fit in one roll. The calculator does both and rounds up, allowing for pattern repeat.
How big is a standard wallpaper roll?
A standard European roll is about 10 metres long and 53 cm wide, covering roughly 5 square metres before wastage. American rolls are wider and shorter.
How does pattern repeat affect how much I need?
A larger repeat wastes more paper per strip because each drop must line up with the next, so you get fewer usable strips per roll and need more rolls overall.
Should I buy extra wallpaper?
Yes — always order at least one extra roll. It covers cutting mistakes and gives you matching stock for future repairs, since colours vary between batches.